TWI797753B - Sound device using loudspeaker to dissipate heat and control method using the same - Google Patents

Abstract

A sound device is disclosed. The sound device comprises a loudspeaker box, a loudspeaker, a temperature detector, a central processing unit and a signal amplifier. The loudspeaker box comprises a sound outlet. The loudspeaker is disposed in the loudspeaker box. The temperature detector is used to detect the temperature of the sound device and generates a feedback signal. The central processing unit pre-stores a preset audio signal, wherein when the central processing unit determines that the speaker is in a standby state and the temperature of the sound device exceeds a temperature threshold by the feedback signal, the central processing unit outputs the preset audio signal, wherein the preset audio signal is a periodic signal, and every cycle of the periodic signal comprises a positive half-cycle waveform and a negative half-cycle waveform which are switched alternately. The signal amplifier is connected between the central processing unit and the loudspeaker to amplify the preset audio signal and provides it to the loudspeaker so that a diaphragm of the loudspeaker is vibrated according to the amplified preset audio signal

Description

Sound generating device using loudspeaker for heat dissipation and applicable control method thereof

This case belongs to the field of sound-generating devices, especially a sound-generating device that uses loudspeakers to dissipate heat and its applicable control method.

Sounding devices (or portable electronic devices), such as mobile phones, etc., due to the advancement of cameras and wireless communication speeds, high-definition video, 3D mobile games and 5G communications are popular on sounding devices, which has led to an increase in the number of sounding devices There are many burdens, so how to improve the heat dissipation in the sound generating device has become an increasingly important issue.

Most of the current sound generating devices adopt passive heat dissipation, that is, materials with high thermal conductivity are used to transfer the heat energy of the heat source to the surface of the sound generating device by heat conduction, and then transfer to the ambient air by heat convection to reduce the temperature of the heat source the goal of. However, the amount of heat that passive cooling can solve is limited by the size of the surface area of the sounding device, and under the development trend of miniaturization and high functionality, the effect of passive cooling cannot be greatly increased, so passive cooling is often the first choice for sounding devices. Design bottlenecks.

Therefore, how to develop a sound generating device using a speaker to dissipate heat and an applicable control method thereof that can improve the above-mentioned prior art is an urgent need at present.

This case is a sound generating device using speakers for heat dissipation and its applicable control method to solve the problem that the traditional sound generating device adopts passive heat dissipation, and the effect of passive heat dissipation cannot be improved due to the limitation of the surface area of the sound generating device.

In order to achieve the aforementioned purpose, one of the wider implementation aspects of this case is to provide a sound generating device, including a speaker box, a speaker, a temperature detector, a central processing unit and a signal amplifier. The speaker box includes a sound outlet. The speaker is arranged in the speaker box. The temperature detector is used to detect the temperature of the sound generating device and generate a feedback signal. The central processing unit pre-stores a preset audio signal, and judges whether the temperature of the sounding device exceeds the temperature threshold value through the feedback signal. When the central processing unit determines that the speaker is in a standby state and the temperature of the sounding device exceeds the temperature threshold value, the central processing unit The processor outputs a preset audio signal, wherein the preset audio signal is a periodic signal and each cycle includes alternately switched positive half-cycle waveforms and negative half-cycle waveforms. The signal amplifier is connected between the central processing unit and the loudspeaker to amplify the preset audio signal and provide it to the loudspeaker.

In order to achieve the above-mentioned purpose, another wider implementation aspect of this case is to provide a control method, which is applied to a sound-generating device, wherein the sound-generating device includes a speaker box, a speaker, a temperature detector, a central processing unit, and a signal amplifier. The method includes: using a temperature detector to detect the temperature of the sounding device, and generating a feedback signal; the central processing unit continuously determines whether the speaker is in a standby state, and judges the temperature of the sounding device through the feedback signal sent by the temperature detector Whether the temperature threshold is exceeded; when the central processing unit judges that the speaker is in standby mode and the temperature of the sounding device exceeds the temperature threshold, the central processing unit outputs a preset audio signal, wherein the default audio signal is a periodic signal and each cycle includes The positive half-cycle waveform and the negative half-cycle waveform are alternately switched; and the preset audio signal is amplified by the signal amplifier and provided to the speaker.

Some typical embodiments embodying the features and advantages of the present application will be described in detail in the description in the following paragraphs. It should be understood that this case can have various changes in different aspects, all of which do not depart from the scope of this case, and the descriptions and diagrams therein are used for illustration in nature, rather than to limit this case.

Please refer to Fig. 1, Fig. 2, Fig. 3 and Fig. 4, wherein Fig. 1 is a system block diagram of a sound generating device in a preferred embodiment of the case, and Fig. 2 is a partial structure of the sound generating device in the first preferred embodiment. The sectional schematic diagram under the embodiment, the 3rd figure is the waveform schematic diagram of the amplified preset audio signal received by the speaker shown in the 1st figure from the preset audio signal amplifier in the time domain, and the 4th figure is the schematic diagram of the waveform shown in the 1st figure The relationship diagram of the maximum swing distance corresponding to each frequency of the amplified preset audio signal received by the loudspeaker from the preset audio signal amplifier shown in FIG. As shown in Figures 1 to 4, the sound generating device 1 in this case can be, but not limited to, portable electronic devices such as mobile phones or notebook computers. The sound generating device 1 includes a speaker 2, a temperature detector 3, and a central processing unit 4 , signal amplifier 5 and speaker box 6. The speaker 2 is located in the speaker box 6 , wherein the speaker box 6 includes a sound outlet 60 , and the sound generating device 1 can play a main audio that can be heard by the human ear through the speaker 2 .

The temperature detector 3 is used to detect the temperature of the sound generating device 1 and generate a feedback signal correspondingly. In some embodiments, the temperature detector 3 can be built into the host (host) of the sound generating device 1, and the host can further include a speaker 2, a central processing unit 4, a signal amplifier 5 and a speaker box 6, etc., but the temperature detector The tester 3 can also be constituted by an external circuit and be installed in the sound generating device 1 independently of the host.

The central processing unit 4 is pre-stored with a preset audio signal. In addition, the central processing unit 4 further receives the feedback signal output by the temperature detector 3, so as to determine whether the temperature of the sounding device 1 exceeds the temperature threshold by the feedback signal, and It is judged whether the speaker 2 is in a standby state. In this embodiment, the aforementioned standby state means that the speaker 2 does not need to play main audio. When the loudspeaker 2 is in the standby state (i.e. no main audio needs to be played) and the central processing unit 4 judges that the temperature of the sounding device 1 exceeds the temperature threshold, the central processing unit 4 outputs a preset audio signal, wherein the default audio signal is a periodic signal, and each cycle includes alternately switched positive half-cycle waveforms (0 degrees to 180 degrees in the time domain as shown in Figure 3) and negative half-cycle waveforms (180 degrees to 360 degrees in the time domain as shown in Figure 3 degree), and the default audio signal is an audio signal that cannot be heard by humans (that is, the frequency of the default audio signal is lower than the threshold frequency that can be heard by human ears, such as 20 Hz). In addition, when the central processing unit 4 judges that the speaker 2 is not in the standby state (that is, the main audio needs to be played) or the temperature of the sound generating device 1 does not exceed the temperature threshold, the central processing unit 4 stops outputting the preset audio signal.

In some embodiments, the preset audio signal pre-stored by the central processing unit 4 can be calculated and generated by a microcontroller unit (microcontroller unit, MCU) or a digital signal processor (digital signal processor, DSP) (both not shown), and Prestored in the central processing unit 4, but not limited thereto. In other embodiments, the preset audio signal can be generated by music editing software and pre-stored in the central processing unit 4 . In addition, the default audio signal can be a sinusoidal wave, and the following are examples of the default audio signal as a sinusoidal wave, where the expression of the sinusoidal wave is Y=Asinθ, Y is the voltage value of the sinusoidal wave, and A is the speaker 2 The rated voltage received, θ is an angle, and its range is from 0° to 360°.

The signal amplifier 5 is connected between the central processing unit 4 and the loudspeaker 2, and is used to amplify the preset audio signal output by the central processing unit 4, and provide it to the loudspeaker 2, so that the diaphragm (not shown) of the loudspeaker 2 is amplified according to the The preset audio signal corresponding to the vibration, wherein the amplified preset audio signal output by the signal amplifier 5 is consistent with the waveform and characteristics of the preset audio signal output by the central processing unit 4, except that the amplitude is increased, and the second Figure 3 and Figure 4 show the waveform of the amplified preset audio signal in the time domain and frequency domain respectively, and it can be seen from Figure 3 and Figure 4 that the amplified preset audio signal is a periodicity signal, and each cycle includes a positive half-cycle waveform and a negative half-cycle waveform that are switched alternately (the default audio signal output by the central processing unit 4 is also the same, and will not be described in detail), wherein the positive half-cycle waveform of the preset audio signal after the amplification When the vibration of the vibrating membrane of the speaker 2 causes the heat source 7 in the sound generating device 1 to be discharged out of the sound generating device 1 through the sound outlet 60, and is passed through the speaker 2 when the negative half cycle waveform of the audio signal is preset. The vibration of the vibrating membrane draws cold air outside the sound generating device 1 into the sound generating device 1 through the sound outlet 60, so that the sound generating device 1 of this case can drive the speaker 2 when the speaker 2 is in a standby state and the sound generating device 1 has heat dissipation requirements It operates according to the positive half-cycle waveform and negative half-cycle waveform of the preset audio signal, so that the sound generating device 1 actively dissipates heat when the user cannot hear it, so the heat dissipation of the sound generating device 1 in this case is not limited by the size of the surface area And can increase the cooling effect.

In the above-mentioned embodiment, the vibration of the vibrating membrane of the speaker 2 can drive the air in the speaker box 6 to circulate toward the sound outlet 60, so when the amplified preset audio signal is a positive half-cycle waveform, the vibrating membrane of the speaker 2 The vibration direction of the loudspeaker 2 is toward the direction close to the sound outlet 60 to discharge the hot air in the sound generating device 1, and when the amplified preset audio signal is a negative half-cycle waveform, the vibration direction of the vibrating membrane of the speaker 2 is away from the sound output. The direction of the opening 60 is used to draw cold air into the sound generating device 1 .

In order to improve the heat dissipation effect of the sounding device 1, in some embodiments, as shown in Fig. 3 and Fig. 4, under a cycle formed by a positive half-cycle waveform and a negative half-cycle waveform in the preset audio signal, the positive The frequency of the half-cycle waveform is faster than the frequency of the negative half-cycle waveform. In other words, the time length of the positive half-cycle waveform is shorter than the time length of the negative half-cycle waveform. In this way, the vibration mode of the vibrating membrane of the loudspeaker 2 is fast push and slow pull, that is, in In the fast push mode, the hot air in the sound generating device 1 is discharged as soon as possible, and in the slow pulling mode, the cold air outside the sound generating device 1 is sucked into the sound generating device 1 with the maximum amount. Corresponding to Figure 3 and Figure 4, it can be seen that when the angles in the time domain shown in Figure 3 are 90 degrees and 270 degrees, they can correspond to the maximum positive and negative voltages of the vibrating membrane of the speaker 2 at different frequencies. Swing distance (Excursion). As can be seen from Figure 4, according to the characteristics of the diaphragm material, the maximum swing distance at different frequencies is also different. When the negative half-period waveform of the preset audio signal is at F1 Hz, the shimmy distance is smaller compared to the F2 Hz operation, but the amount of cold air sucked by the sound outlet 60 can still be increased due to the slower vibration of the diaphragm. In other words, when the positive half cycle waveform of the preset audio signal is at F2 Hz, compared with the operation at F1 Hz, the vibrating membrane swings faster, so that the hot air in the speaker box 6 can be quickly removed (marked in Figure 4 E is the maximum swinging distance of the vibrating membrane when the preset audio signal is F2Hz).

Please refer to FIG. 2 again. In this embodiment, the sound generating device 1 further includes a first housing 61 , a second housing 62 and a first heat transfer medium 63 . The first housing 61 is made of a metal heat-conducting material, such as copper or aluminum, and the second housing 62 is made of plastic, and the first housing 61 and the second housing 62 are further assembled to jointly define a cavity. The speaker box 6 of the body 64 , in addition, at least part of the first casing 61 and the second casing 62 are separated from each other to form the sound outlet 60 of the speaker box 6 . Furthermore, the first casing 61 further includes an extension portion 610 protruding from the outside of the speaker box 6 . In addition, the speaker 2 is located in the cavity 64 and disposed on the second casing 62 . What’s more, the first heat transfer medium 63 is located between the heat source 7 and the extension portion 610 of the first housing 61 , and is in contact with the heat source 7 and the extension portion 610 , which can be but not limited to heat dissipation paste, heat conduction film or solder. As can be seen from Figure 2, the heat energy generated by the heat source 7 can be conducted to the speaker box 6 through the first heat transfer medium 63 and the first housing 61, so that the cold air in the speaker box 6 becomes hot air, and then The hot air in the speaker box 6 is discharged by the vibrating operation of the vibrating membrane of the speaker 2, and the cold air is sucked into the speaker box 6 to achieve the purpose of heat dissipation.

Please refer to FIG. 5 , which is a schematic cross-sectional view of a part of the structure of the sound generating device under the second preferred embodiment. The structure of the sound generating device 1a of this embodiment is similar to the sound generating device 1 shown in Fig. 1 and Fig. 2, so the same symbols are used to mark to represent that the structure and characteristics of the components are similar and will not be described again, but the sound generating device of this embodiment In addition to the first housing 61, the second housing 62 and the first heat transfer medium 63 as shown in Figure 2, 1a further includes a second heat transfer medium 65, and the first housing 61 does not have In addition, the first heat transfer medium 63 is only in contact with the heat source 7 and not in contact with the first casing 61, and the second heat transfer medium 65 is located between the first heat transfer medium 63 and part of the first casing 61, And it is in contact with the first heat transfer medium 63 and the first casing 61 . What's more, the first heat conduction medium 63 and the second heat conduction medium 65 may be, but not limited to, constituted by different heat conduction mediums such as heat dissipation paste, heat conduction film, or solder. As can be seen from Fig. 5, the heat energy generated by the heat source 7 can be conducted to the speaker box 6 through the first heat transfer medium 63, the second heat transfer medium 65 and the first housing 61, so that the cold air in the speaker box 6 becomes The hot air is then discharged from the speaker box 6 through the vibrating operation of the vibrating membrane of the speaker 2, and the cold air is sucked into the speaker box 6 to achieve the purpose of heat dissipation.

In some embodiments, the first housing 61 can utilize the plasticity of metal to form at least one heat dissipation fin (not shown), so as to increase the heat dissipation area and improve the heat dissipation efficiency of the sound generating device 1a.

Please refer to Figure 6, and cooperate with Figures 1 to 4, wherein Figure 6 is a schematic flowchart of a control method applicable to the sounding device shown in Figure 1 in a preferred embodiment of the present case. As shown in Fig. 6, the control method of the sound generating device in this case includes the following steps.

Step S1, using the temperature detector 3 to detect the temperature of the sound generating device 1, and generating a feedback signal.

In step S2, the central processing unit 4 continues to judge whether the speaker 2 is in a standby state (that is, whether it is not necessary to play the main audio), and judges whether the temperature of the sound generating device 1 exceeds the temperature threshold based on the feedback signal from the temperature detector 3 value.

Step S3 , when the CPU 4 judges that the speaker 2 is in a standby state and the temperature of the sound generating device 1 exceeds a temperature threshold, the CPU 4 outputs a preset audio signal.

Step S4 , amplifying the preset audio signal by the signal amplifier 5 and providing it to the speaker 2 .

In some embodiments, the control method of the sound generating device of this case may further include step S5, the vibrating membrane of the speaker 2 vibrates correspondingly according to the amplified preset audio signal, so that when the preset audio signal has a positive half cycle waveform, the vibrating membrane The hot air in the sound generating device 1 is discharged out of the sound generating device 1 through the sound outlet 60 of the speaker box 6, and the cold air outside the sound generating device 1 is discharged through the vibrating membrane when the negative half-cycle waveform of the preset audio signal The mouth 60 sucks into the sound generating device 1 . Certainly, in some embodiments, step S1 may be re-executed after step S5 is executed.

To sum up, this project provides a sound generating device that utilizes the speaker to dissipate heat and its applicable control method. When the speaker is in a standby state and there is a need for heat dissipation, the sound generating device drives the speaker according to the positive half-cycle waveform and the negative half-cycle waveform of the preset audio signal. The operation enables the sound generating device to actively dissipate heat when the user cannot hear it. Therefore, the heat dissipation of the sound generating device in this case is not limited to the size of the surface area, and the heat dissipation effect can be increased.

1, 1a: sound generating device 2: Speaker 3: Temperature detector 4: CPU 5: Signal Amplifier 6: Speaker box 7: heat source 60: Sound outlet Y: Voltage value of the sine wave F1: The frequency at which the negative half-cycle waveform of the preset audio signal has the maximum swing distance of the positive voltage F2: The frequency at which the positive half-cycle waveform of the preset audio signal has the maximum swing distance of positive voltage 61: First shell 62: Second housing 63: First heat transfer medium 64: Cavity 610: Extension 65: Second heat transfer medium E: Maximum swing distance

Fig. 1 is the system block diagram of the sound generating device of the preferred embodiment of the present case; Fig. 2 is a schematic cross-sectional view of part of the structure of the sounding device under the first preferred embodiment; Fig. 3 is a waveform schematic diagram in the time domain of the amplified preset audio signal received by the speaker shown in Fig. 1 from the preset audio signal amplifier; Figure 4 is a relationship diagram of the maximum swing distance corresponding to each frequency of the amplified preset audio signal received by the speaker shown in Figure 1 from the preset audio signal amplifier; Fig. 5 is a schematic cross-sectional view of part of the structure of the sounding device under the second preferred embodiment; Fig. 6 is a schematic flowchart of a control method applicable to the sound generating device shown in Fig. 1 according to a preferred embodiment of the present application.

1: sound generating device 2: Speaker 3: Temperature detector 4: CPU 5: Signal Amplifier

Claims (12)

A sounding device, comprising: a speaker box, including a sound outlet; a speaker, arranged in the speaker box; a temperature detector, used to detect the temperature of the sounding device, and generate a feedback signal; A central processing unit pre-stores a preset audio signal, and judges whether the temperature of the sound-generating device exceeds a temperature threshold based on the feedback signal, wherein when the speaker is in a standby state and the temperature of the sound-generating device exceeds the temperature threshold value, the central processing unit outputs the preset audio signal, wherein the preset audio signal is a periodic signal and each cycle includes a positive half-cycle waveform and a negative half-cycle waveform alternately switched; and a signal amplifier connected to Between the CPU and the loudspeaker, the preset audio signal is amplified and provided to the loudspeaker; wherein the duration of the positive half-cycle waveform is shorter than the duration of the negative half-cycle waveform. The sound generating device as described in claim 1, wherein a vibrating membrane of the speaker vibrates correspondingly according to the amplified preset audio signal, so that the vibrating membrane will emit a sound when the preset audio signal has a positive half cycle waveform The hot air in the device is discharged out of the sound-generating device through the sound outlet, and the cold air outside the sound-generating device is sucked into the sound-generating device through the vibrating membrane during the negative half-cycle waveform of the preset audio signal. inside the device. The sound generating device as described in claim 1, wherein the preset audio signal is an audio signal that humans cannot hear. The sound generating device as claimed in claim 1, wherein the preset audio signal is a sine wave. The sounding device as described in claim 2, wherein when the amplified preset audio signal is the positive half-cycle waveform, the vibration direction of the vibrating membrane faces the direction close to the sound outlet, and the amplified preset audio signal When the signal is the negative half cycle waveform, the vibration direction of the vibrating membrane is away from the direction of the sound outlet. The sounding device as described in Claim 1, wherein the sounding device further comprises a first casing, a second casing and a first heat transfer medium, the first casing is made of a metal heat conducting material, and the second The casing is made of a plastic, and the first casing and the second casing are assembled together to define the speaker box, and the first casing further includes an extension part protruding from the Outside the speaker box, the first heat transfer medium is located between a heat source and the extension of the first casing, and is in contact with the heat source and the extension. The sound generating device as described in claim 1, wherein the sound generating device further comprises a first casing, a second casing, a first heat transfer medium and a second heat transfer medium, and the first casing is made of a metal heat conduction material constituted, the second housing is made of a plastic, and the first housing and the second housing are combined to jointly define the speaker box, the first heat transfer medium is in contact with a heat source, the first The second heat transfer medium is located between the first heat transfer medium and part of the first casing, and is in contact with the first heat transfer medium and the first casing. The sound generating device according to claim 7, wherein the first heat transfer medium and the second heat transfer medium are respectively composed of different heat transfer media. A control method, applied to a sound generating device, wherein the sound generating device includes a speaker box, a speaker, a temperature detector, a central processing unit and a signal amplifier, the control method includes: using the temperature detector Detect the temperature of the sound generating device and generate a feedback signal; The central processing unit continues to judge whether the speaker is in a standby state, and judges whether the temperature of the sound generating device exceeds a temperature threshold value through the feedback signal sent by the temperature detector; when the central processing unit judges that the When the speaker is in the standby state and the temperature of the sound generating device exceeds the temperature threshold, the central processing unit outputs a preset audio signal, wherein the preset audio signal is a periodic signal and each cycle includes a positive A half-cycle waveform and a negative half-cycle waveform; and the preset audio signal is amplified by the signal amplifier and provided to the speaker; wherein the time length of the positive half-cycle waveform is shorter than the time length of the negative half-cycle waveform. The control method as described in claim 9, wherein a vibrating membrane of the speaker vibrates correspondingly according to the amplified preset audio signal, so that the vibrating membrane will emit sound when the preset audio signal has a positive half cycle waveform The hot air in the device is discharged out of the sound-generating device through a sound outlet of the speaker box, and the cold air outside the sound-generating device is discharged out of the sound-generating device through the vibrating membrane when the preset audio signal is in the negative half cycle waveform. The sound port is sucked into the sound generating device. The control method as described in Claim 9, wherein the preset audio signal is an audio signal that humans cannot hear. The control method as described in Claim 9, wherein the preset audio signal is a sine wave.

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